Buff added their new ThermoNet technology to the Multifunctional Headwear piece you already know and love. Designed for cold weather activities it delivers four times the insulation of Buff's original microfiber construction without adding extra bulk. And of course Buff's Multifunctional Headwear lives up to its name so wear it as a balaclava a neck gaiter a headband or a pirate cap--the opportunities are endless.